Seeking help in identifying pressure pipelines
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Pressure pipelines refer to tubular devices that use a certain pressure to transport gases or liquids. They are defined as those with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, where the medium is a gas, liquefied gas, steam, or a liquid that is flammable, explosive, toxic, corrosive, and has a maximum operating temperature equal to or higher than its standard boiling point; furthermore, such pipelines have a nominal diameter of 50 mm or more. Except for pipes with a nominal diameter of less than 150 mm and a maximum operating pressure of less than 1.6 MPa (gauge pressure), as well as the pipes that form part of the equipment used for transporting non-toxic, non-flammable, and non-corrosive gases. Among them, the safety supervision and management of oil and gas pipelines shall also be carried out in accordance with laws and regulations such as the Work Safety Law and the Oil and Gas Pipeline Protection Law. Is water with DN100, 1.0MPaG, and 120°C considered a pressure pipeline? It is considered such. Is water vapor with DN100, 1.0MPaG, and 180°C considered a pressure pipeline? It is considered such as well
Steam pipes belong to them, while water pipes do not.
This post was last edited by blotch on 2017-12-24 at 17:10. Notice from the General Office of the Quality Inspection Administration regarding issues related to the safety supervision of pressure pipelines and cylinders (Quality Inspection Office Special Document No. 2015-675). The term \"non-toxic, non-flammable, and non-corrosive gases\" as referred to in the provisions concerning pipelines with a nominal diameter of less than 150 mm and a maximum working pressure of less than 1.6 MPa (gauge pressure) does not include liquefied gases, steam, and oxygen. “Therefore, the DN100 steam line is a pressure pipeline. The issue with DN100 water pipes lies in their standard boiling point; by standard boiling point is meant the saturation temperature at 1 standard atmosphere, so water pipes at 120 degrees are also pressure pipes.
Your judgment is correct; the temperature of the water is above the standard boiling point, and the pipe diameter and pressure meet the criteria for pressure pipes, so it falls under the category of pressure pipes
The temperature of the water is higher than the standard boiling point, so it falls under the category of pressure pipes
You’re right, is the design temperature for the pipes 120°C? That is, the design takes into account the gas-liquid mixture in the extreme condition of this pipeline
Water also falls into this category, when its temperature is higher than the standard boiling point